The possibility of damage from operating a...

The possibility of damage from operating a...

Question 1 of 270705eccefa1bacbc34ba4d475de

The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of __________.

Question 1 of 27070

Q

The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of __________.

🔍 Key Concepts

• critical speed in diesel engines and how it relates to vibration • difference between torsional vibration in the crankshaft and vibration transmitted to the hull or foundations • purpose of governors, mounts, and dampers in engine installations

💭 Think About

• Think about what kind of damage occurs when an engine runs at or near a critical speed. Which part of the engine is most at risk? • Which device directly addresses twisting or oscillation of the crankshaft itself, rather than just controlling speed or isolating the engine from the ship’s structure? • For each choice, ask: does this mainly control speed, absorb motion between engine and hull, or reduce internal vibration in rotating parts?

✅ Before You Answer

• Identify which option is specifically designed to reduce torsional vibration in rotating shafts. • Separate devices that control engine speed from those that absorb or damp vibration. • Consider which component is usually fitted at the free end of the crankshaft to protect it from damage at critical speeds.